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> Here you find another link with more information regarding the exposure compensation. Open the link and go for "Exposure compesation" http://www.clearsightusa.com/technotes.html Hope you will find what you are looking for. bye Marc
The tables and explanation on the Clearsight site are good, but not quite it.
They ignore the effect of asymmetry in lens designs. However, the 80 mm lens is almost symmetrical, and the deviation is negligible.
The tabulated values for the longer lenses in particular do show a small but significant fault.
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